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Add credentials

To access Apache Iceberg tables stored in Amazon S3, you’ll need to configure your credentials.
  1. Create a new pipeline or open an existing pipeline.
  2. Expand the left side of your screen to view the file browser.
  3. Scroll down and click on a file named io_config.yaml.
  4. Enter the following keys and values under the key named default (or the profile you are using): 
    version: 0.1.1
default:
  AWS_ACCESS_KEY_ID: ...
  AWS_SECRET_ACCESS_KEY: ...
  AWS_REGION: us-west-2  # or the region where your S3 bucket is located
    These credentials must have read/write access to the S3 bucket that contains your Iceberg tables.

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Using Python block

You can use Mage to load data from Iceberg tables stored in S3 or export data to Iceberg tables using a configurable Python block. Steps
  1. Create or open a pipeline in your Mage Pro cluster.
  2. Add a block of type Data Loader or Data Exporter.
  3. From the block template list, choose:
    Data lakes → Apache Iceberg
  4. In the generated code block, update the following required configuration parameters:
    • base_uri: The URI of your data lake storage (e.g., s3://your-bucket-name/warehouse)
    • bucket_name: Name of your S3 bucket
    • table_name: Fully qualified name of your Iceberg table (e.g., db_name.table_name)
  5. If you’re using a non-default profile, update the config_profile field accordingly.
  6. Run the block to load or export data from your Iceberg table stored on S3.

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Notes

  • The Iceberg integration supports direct access to tables through metadata stored in S3.
  • Make sure the table_path points to the root directory of the Iceberg table (i.e., where the metadata/ folder resides).
  • Mage uses a Postgres-backed Iceberg catalog by default. If you’re using a different catalog (e.g., Hive or REST), you can customize the configuration to point to your specific catalog endpoint and type.

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Using Iceberg with PySpark

Mage Pro supports reading from and writing to Apache Iceberg tables using PySpark, enabling scalable and efficient data lake operations.

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Example code

Using Iceberg with Google Cloud Storage (GCS) 
from pyspark.sql import SparkSession

spark = SparkSession.builder \
    .appName("IcebergWithGCS") \
    .config("spark.jars.packages", "org.apache.iceberg:iceberg-spark-runtime-3.5_2.12:1.5.1") \
    .config("spark.jars", "/opt/spark/jars/gcs-connector-hadoop3-2.2.5-shaded.jar") \
    .config("spark.sql.extensions", "org.apache.iceberg.spark.extensions.IcebergSparkSessionExtensions") \
    .config("spark.sql.catalog.iceberg", "org.apache.iceberg.spark.SparkCatalog") \
    .config("spark.sql.catalog.iceberg.type", "hadoop") \
    .config("spark.sql.catalog.iceberg.warehouse", "gs://mage_icerberg_test/test") \
    .config("spark.hadoop.fs.gs.impl", "com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystem") \
    .config("spark.hadoop.google.cloud.auth.service.account.enable", "true") \
    .config("spark.hadoop.google.cloud.auth.service.account.json.keyfile", "/home/src/default_repo/your_google_service_account_key.json") \
    .getOrCreate()
Create and Write an Iceberg Table 
# Sample DataFrame
df = spark.createDataFrame([
    (1, "apple"),
    (2, "banana"),
    (3, "banana"),
], ["id", "fruit"])

# Create the database if it doesn't exist
spark.sql("CREATE DATABASE IF NOT EXISTS iceberg.db_name")

# Write data to an Iceberg table
df.writeTo("iceberg.db_name.iceberg_table") \
  .using("iceberg") \
  .createOrReplace()

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Notes

  • iceberg.db_name.iceberg_table uses the Hadoop catalog type and stores metadata in the specified GCS path.
  • You can modify the catalog configs to use Hive, Glue, or Nessie depending on your architecture.
  • For AWS S3, update the warehouse path and authentication configurations accordingly.
  • The Google service account key file path must be accessible inside the Mage Pro cluster.
  • You can run this code inside a block in Mage Pro batch pipeline.